#include #include #include #include #include using namespace std; class Serializer { public: virtual void serialize(ostream&)=0; virtual void deserialize(istream&)=0; virtual ~Serializer()=0; }; Serializer::~Serializer() = default; class Base : public Serializer { public: Base() = default; Base(int i) : m_i{i},m_array{nullptr},m_arrsz{0} {} ~Base() override { delete [] m_array; } void set_array(int* p_array, size_t size) { m_array = new int[size]; for(size_t i{0}; i> m_i; // read the array size is >> m_arrsz; // allocate array m_array = new int[m_arrsz]; // read each array element for(size_t i{0}; i> m_array[i]; } } string tostring() const { stringstream ss; ss << "Base Data :\n"; ss << "m_i = " << m_i << '\n' << arr_to_string() << '\n'; return ss.str(); } protected: string arr_to_string() const { stringstream ss; ss << "array ="; for(size_t i{0}; i> m_f; } string tostring() const { stringstream ss; // Base first ss << Base::tostring(); // own data ss << "Derived Data :\n" << "m_f = " << fixed << setprecision(2) << m_f << '\n'; return ss.str(); } protected: float m_f = 0.0f; }; class Derived2 : public Derived { public: Derived2() = default; Derived2(int i, float f, vector const& from) : Derived{i,f}, m_vector{from} {} ~Derived2() = default; void serialize(ostream& os) override { // parent first Derived::serialize(os); // write size of vector os << ' ' << m_vector.size(); // write each element for(auto v : m_vector) { os << ' ' << v; } } void deserialize(istream& is) override { // parent first Derived::deserialize(is); // own data // read vector size size_t sz; is >> sz; // fill the vector int data; for(size_t i{0}; i> data; m_vector.emplace_back(data); } } string tostring () const { stringstream ss; // parent first ss << Derived::tostring(); // own data ss << "Derived2 Data :\n" << vector_to_string(); return ss.str(); } protected: string vector_to_string() const { stringstream ss; ss << "vector ="; for(auto v : m_vector) { ss << ' ' << v; } ss << '\n' << ends; return ss.str(); } vector m_vector; }; int main() { Derived d1(10, 3.14f); int from[]{1,3,5,7,9,11}; d1.set_array(from, sizeof(from)/ sizeof(from[0])); // display current state of d1 object cout << "Derived object d1 in memory\n"; cout << d1.tostring() << "\n"; // write the state to the archive ofstream ofs("ch.txt",ios::binary); d1.serialize(ofs); // Derived2 object vector vec{2,4,6,8,10,12}; Derived2 d3{10, 3.14f,vec}; d3.set_array(from, sizeof(from)/ sizeof(from[0])); // Display current state of // Derived2 object d3 in memory cout << "Derived2 object d3 in memory\n"; cout << d3.tostring() << "\n\n"; // write the state of d3 to // archive d3.serialize(ofs); ofs.close(); // prepare for reading from // archive ifstream ifs("ch.txt",ios::binary); // read the state from archive Derived d2; d2.deserialize(ifs); Derived2 d4; d4.deserialize(ifs); ifs.close(); // display the state of d2 object // read from the archive cout << "Derived object d2 read from archive\n"; cout << d2.tostring() << '\n'; // display the state of Derived2 // object d4 read from the archive cout << "Derived2 object d4 read from archive\n"; cout << d4.tostring(); };

serialize_class_hierarchy_with_dynamic_object.cpp